Say, you want to know the decimal equivalent of the hexadecimal 15A.
You can convert in many different ways, all within bash, and relatively easy.
To convert a number from hexadecimal to decimal:
$ echo $((0x15a))
346
$ printf '%d\n' 0x15a
346
$ perl -e 'printf ("%d\n", 0x15a)'
346$ echo 'ibase=16;obase=A;15A' | bc
346
Note that ibase and obase specify the input and the output notation respectively.
By default, the notation for both is decimal unless you change it using ibase or obase.
Because you change the notation to hex using ibase, your obase needs to be specified in hex (A in hex = 10 in decimal).
The input number (15A) needs to be in UPPER case. 15a will give you a parse error.
To convert from decimal to hex,
$ printf '%x\n' 346
15a
$ perl -e 'printf ("%x\n", 346)'
15a$ echo 'ibase=10;obase=16;346' | bc
15A
15 comments:
thankx man
Thanks
quick online hex to decimal converter
:)
David
how do you convert in file?
Hey this is adithya.
You can use perl to print in binary also.
perl -e 'printf "%b\n", 10'
1010
perl -e 'printf "%d\n", 0b1010'
10
Adithya again..
To convert in a file, follow the steps.
1. open file in vim
2. type :echo printf('%x',1024)
will print 400 as hex.
3. type :echo 0x110 will print its decimal value immediately. no need of printf
You can do math (integers only) and conversion directly with bash and printf. You can even mix hex and decimal numbers:
printf "%x" $[0x5 + 0x5 + 10]
printf "%d" $[0x5 + 0x5 + 10]
To convert hex in dec you can use only echo, if you want to:
echo $[0x5 + 0x5 + 10]
Regards
a script named '?' calculate and convert binary, decimal and hex:
#! /bin/bash
#
[[ -z "$1" ]] && echo -e "32bit calc with perl\nusage: `basename $0` _ | 0x_ | 0b_" && exit
Cmd="printf \"%d 0x%x 0b%b\\n\",$1,$1,$1"
perl -e "$Cmd"
example:
/usr/local/bin$ ? 0b11+0xff+99
357 0x165 0b101100101
SoftICE live! ;-)
new revision with octal and float:
#!/bin/bash
#
[ -z "$1" ] && printf "32bit calc with perl\nusage: `basename $0` _ | 0x_ | 0b_ | 0_ \n" && exit
perl -e "printf \"%d %f 0x%x 0b%b 0%o \\n\",$1,$1,$1,$1,$1"
example:
~$ ? 13579+0xACE+0b10101+01357
17117 17117.000000 0x42dd 0b100001011011101 041335
So very nice. Thanks!
How can you do this for signed numbers?
Such as:
echo $((0xffffff9f)) gives me 4294967199 but i am looking for the output -97
Dear Sachin!
You should write this:
echo $(( ~0xff | 0x9f ))
I think you have a 64bit machine, so you have to set on all of the high bits!
You can write this too:
echo $(( 0xffffffffffffff9f ))
The first one is more general, works on 32bit and 64bit machines as well.
Have a nice day!
David
Thanks dude. This was very helpful.
Nice one!
I used it to create bash functions :)
Thank you very much for this inspirational info !!!
Post a Comment